This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A141210 #3 Mar 03 2013 13:10:40 %S A141210 1,2,1,4,3,4,7,6,10,9,12,11,20,24,25,19,18,34,45,60,49,30,29,56,78, %T A141210 115,126,121,45,44,86,123,190,231,286,225,67,66,130,189,300,385,528, %U A141210 555,484,97,96,190,279,450,595,858,1005,1144,900 %N A141210 Triangle read by rows, A140207^2. %C A141210 Left border of the triangle = A000070; right border = A001255. %F A141210 A140207^2 as an infinite lower triangular matrix. %e A141210 First few rows of the triangle are: %e A141210 1; %e A141210 2, 1; %e A141210 4, 3, 4; %e A141210 7, 6, 10, 9; %e A141210 12, 11, 20, 24, 25; %e A141210 19, 18, 34, 45, 60, 49; %e A141210 30, 29, 56, 78, 115, 126, 121; %e A141210 ... %Y A141210 Cf. A001255, A141211 (row sums), A140207, A000070. %K A141210 nonn,tabl %O A141210 0,2 %A A141210 _Gary W. Adamson_ & _Roger L. Bagula_, Jun 13 2008